This commit adds a config.yml file under .github/ISSUE_TEMPLATE to disable
blank issues and provide a contact link directing users to create Discussions
for feature requests, bug reports, or questions. This helps streamline issue
reporting and encourages community engagement through GitHub Discussions.

Includes a 'changelog' target to generate CHANGELOG.md using git-cliff, and a
'help' target listing available commands.

- Expand CHANGELOG.md with detailed history for versions 2.0.3 and 2.0.4.
- Revise cliff.toml config: enable conventional commits, restructure commit
  parsers to improve grouping, and update changelog template with PR links.
- Add mise.toml with required CLI tools for changelog and typo checking.

This change enforces filtering of typing attributes to a defined allowed list in
both AppKit and UIKit implementations. It also moves the initialization of
default typing attributes to the declaration line, simplifying the init logic.

Includes entries for versions from 0.5.0 through 2.0.2, covering features,
bug fixes, refactors, and testing updates. Enhances project transparency and
provides traceable release documentation.

This adds a cliff.toml configuration file to define how git-cliff generates
the project changelog. It includes templates for changelog structure,
commit grouping by type, filtering rules, and custom parsers for processing
commit messages. This setup enables automated, structured changelog updates
based on commit history.

Changed access control for replaceCharacters methods from public to open to
enable subclassing and method overrides in external modules. This supports
greater customization and flexibility in text replacement behavior.

- Modified STTextView to allow setting a new textContentManager, updating the
  associated layout manager and content on change.
- Changed STTextContentStorage from final to open to support subclassing.
- Made replaceContents override open to allow customization in subclasses.

Added a new item to the README documenting an issue with `enumerateCaretOffsetsInLineFragmentAtLocation:usingBlock:` having inaccurate documentation.

This commit implements the missing setter methods for accessibility properties, allowing VoiceOver and other assistive technologies to control the text view. It adds setters for selected text, selected text ranges, and focus state, which correspond to the existing getter methods.

The fix ensures that accessibilityFrame(for:) returns coordinates in screen space
by properly converting the text segment frame through the view hierarchy to screen
coordinates.

The existing code used textElements(for:) which can return an empty array. This patch uses enumerateTextElements(from:) instead, which is safer since it can enumerate elements starting at a given location without the risk of an empty result.

The commit extends NSAccessibilityProtocol implementation in STTextView by adding
support for NSAccessibilityStaticText and NSAccessibilityNavigableStaticText
protocols. It implements frame, line positioning, and range methods to improve
screen reader compatibility and navigation capabilities within text content.

Resolves an issue with the text layout manager by ensuring proper initialization
order and preventing memory issues. The main changes include setting the primary
text layout manager to nil before removing it, setting text content after setup,
and reordering initialization steps to avoid potential crashes during view setup.

The PR adds a proper setup method for the textLayoutManager and ensures
connections are properly maintained when setting a new one. It fixes delegate
assignment, notification handling, and connection with the textContentManager when
the textLayoutManager is changed.

The changes make STTextContainer open to allow subclassing and make STTextView's
textLayoutManager property fully replaceable by adding proper setup/teardown logic.
This ensures that when replacing the layout manager, all necessary delegate and
observer relationships are properly maintained, fixing potential issues with
notification handling and delegate assignments.

Users can now replace the text layout manager by setting the `textLayoutManager`
property directly on `STTextView`. Additionally, the STTextLayoutManager class
has been made public to allow further customization.

This patch fixes how isEditable and isSelectable properties interact, ensuring
proper behavior when either property changes state. The implementation now
correctly sets interaction modes based on both properties, adding support for
the non-interactive state when neither selection nor editing is enabled.

fixes https://github.com/krzyzanowskim/STTextView/discussions/81

The gutter view now properly clips its contents and maintains correct positioning
when scrolling. This fixes positioning issues by using the frame's minX instead of
bounds.minX for line number cell placement and adds explicit setting of both x and y
coordinates when positioning the gutter view during layout.

Fixes the sizing logic in UIKit implementation of STTextView to correctly handle
text layout based on content size. Removes commented code in the AppKit version,
and improves the resizing logic in the UIKit version by properly calculating
content dimensions based on text layout manager's usage bounds, gutter width,
and scroll insets.

Add a debug log statement with the dimensions of the text container size when it's updated to help troubleshoot layout issues. Also rename a variable for clarity.

This small change ensures completion tasks run with appropriate priority for user interactions.

The commit adds a Task.isCancelled check when filtering completion items to properly handle cancellation during async completion lookups.

The changes add support for async completion providers alongside the existing synchronous
completion API. This allows completion providers to perform asynchronous work like network
requests while maintaining cancellation support through structured concurrency. The
implementation includes both sync and async code paths with proper task cancellation and
logging.

The changes enhance the visual presentation of completion menu items by adding proper padding,
multicolor symbol rendering, font styling, and color adjustments based on the system color
scheme.

The update removes outdated content about known issues and text dragging, and bumps the recommended installation version from 1.0.0 to 2.0.0 in the package dependency example.

Replace preconditionFailure with assertionFailure and return early when
encountering an invalid range in addAttributes(_:range:updateLayout:). This
avoids crashing in release builds if an invalid range is passed.

The NSRange clamped(_:) extension was moved from the
STTextViewAppKit/STTextView+NSTextCheckingClient.swift file to a new file
STTextViewCommon/Extensions/NSRange+Helpers.swift in the common package so it
can be shared between different packages.

This reverts commit bb5e95ed.

Use NSVisualEffectView for the completion background to match window
appearance. Increase corner radius and use continuous corner curve for a
smoother look. Adjust content insets and selection background appearance.

The URL for the STTextView-Plugin-TextFormation repository has been updated to
point to the fork maintained by krzyzanowskim instead of the original ChimeHQ
repository.

Update typing attributes right after changing text attributes, rather than
waiting until the next layout pass. This ensures the typing attributes stay in
sync with the latest text attributes.

The README now only mentions the open source GPL v3.0 license and a
commercial license option, with a link to purchase. The explicit split
into "Open Source" and "Commercial" sections was removed to simplify
and shorten the license description.

When inserting a newline character, use the Unicode scalar value instead of a
literal "\n" string. This ensures the correct newline character is inserted
even if the system uses a non-ASCII newline like CRLF.

When generating attributed string for services menu, if an attachment contains
plaintext file contents, replace the attachment with the inlined text content
in the output string. This allows passing the full content, including from
attachments, to services expecting plaintext input.

This commit adds a new CONTRIBUTING.md file that provides guidelines
for contributors who want to propose changes to the STTextView project.
It covers:

- The requirement to sign the Contributor License Agreement
- The recommended process to start a discussion proposing changes
- Tips to improve the chances of a pull request being reviewed and merged