SF-3373 Fix editor text selection over Lynx insight

[siltomato]

This PR fixes an issue where selecting across text with a lynx insight was breaking the selection. The problematic case was selecting backwards with keyboard selection (shift + arrow keys).

Additionally, in order to fix cursor lag, the editor will switch to the system cursor when the user presses and holds any key that would cause cursor movement. The custom local Quill cursor will be switched back when keys released.

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This change is 

[codecov]

Codecov Report

❌ Patch coverage is 89.74359% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.23%. Comparing base (a37e588) to head (42484de).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...re/ClientApp/src/app/shared/text/text.component.ts	89.74%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3362      +/-   ##
==========================================
+ Coverage   82.21%   82.23%   +0.01%     
==========================================
  Files         608      608              
  Lines       36199    36232      +33     
  Branches     5911     5943      +32     
==========================================
+ Hits        29761    29795      +34     
+ Misses       5579     5564      -15     
- Partials      859      873      +14     

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[pmachapman]

Reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @siltomato)

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src/SIL.XForge.Scripture/ClientApp/src/app/shared/text/text.component.ts line 534 at r1 (raw file):

      .subscribe(event => {
        this.isShiftDown = event.shiftKey;
      });

If you use shift to select multiple characters, keep shift down, then click the taskbar (or anything other than the web browser), release shift, then click inside another verse, the selected verse doesn't get updated correctly.

One way to fix that would be to updated isShiftDown on mousedown, i.e.:

    fromEvent<MouseEvent>(document, 'mousedown')
      .pipe(quietTakeUntilDestroyed(this.destroyRef))
      .subscribe(event => {
        this.isShiftDown = event.shiftKey;
      });

Code quote:

    fromEvent<KeyboardEvent>(document, 'keydown')
      .pipe(quietTakeUntilDestroyed(this.destroyRef))
      .subscribe(event => {
        this.isShiftDown = event.shiftKey;
      });

[siltomato]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @pmachapman)

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src/SIL.XForge.Scripture/ClientApp/src/app/shared/text/text.component.ts line 534 at r1 (raw file):

Previously, pmachapman (Peter Chapman) wrote…

If you use shift to select multiple characters, keep shift down, then click the taskbar (or anything other than the web browser), release shift, then click inside another verse, the selected verse doesn't get updated correctly.

One way to fix that would be to updated isShiftDown on mousedown, i.e.:

    fromEvent<MouseEvent>(document, 'mousedown')
      .pipe(quietTakeUntilDestroyed(this.destroyRef))
      .subscribe(event => {
        this.isShiftDown = event.shiftKey;
      });

Ah, nice catch. I opted for window 'blur', as it seems to handle this case in addition to the case where the window focus changes without a mouse event (like Alt + Tab).

[pmachapman]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @siltomato)