bug(linux): Backspace doesn't work properly with text selection

[ermshiperete]

Install and activate Khmer Angkor or IPA (SIL) keyboard.

Scenario 1

To reproduce

• open gedit
• type a few characters
• select the last three characters selecting from right to left, i.e. starting at the end
• press backspace

Expected behavior:

• selection gets deleted

Actual behavior

• character before the selection gets deleted, selection remains selected

Scenario 2

To reproduce

• open gedit
• type a few characters
• select the last three characters selecting from left to right.
• press backspace

Expected behavior

• selection gets deleted

Actual behavior

• last character gets deleted, selection consists now of two characters. To delete the entire selection, the user has to press backspace three times.

Environment

Tested on Ubuntu 22.04 and 23.04 with X11 and Wayland. Keyman 17 alpha.

[bharanidharanj]

Tested on Ubuntu 22.04 with X11 and Wayland along with Keyman 16.0.139 stable build and I was able to reproduce it.

[mcdurdin]

This seems like a fairly important issue to fix.

[ermshiperete]

This is only happening in apps that support surrounding text, but not e.g. in Chrome.

7870 sounds similar on the Windows side.

Seems to be a problem in Core.

[ermshiperete]

Tests to verify eventual fix:

All tests in gedit. Use "IPA (SIL)" keyboard.

• TEST_SELECTION_BS_EBA:

  • Open gedit
  • Switch to "IPA (SIL)" keyboard
  • Type abcdef
  • click after f
  • press ← key (cursor left) three times to select def
  • press Backspace
  • verify that def is deleted and the remaining text is abc

• TEST_SELECTION_BS_ABE:

  • Open gedit
  • Switch to "IPA (SIL)" keyboard
  • Type abcdef
  • click after c
  • press → key (cursor right) three times to select def
  • press Backspace
  • verify that def is deleted and the remaining text is abc

• TEST_SELECTION_BS_KEY_EBA:

  • Open gedit
  • Switch to "IPA (SIL)" keyboard
  • Type abcndef
  • click after f
  • press ← key (cursor left) three times to select def
  • press Backspace
  • press > key
  • verify that def is deleted and the remaining text is abcŋ

• TEST_SELECTION_BS_KEY_ABE:

  • Open gedit
  • Switch to "IPA (SIL)" keyboard
  • Type abcndef
  • click after n
  • press → key (cursor right) three times to select def
  • press Backspace
  • press > key
  • verify that def is deleted and the remaining text is abcŋ

• TEST_SELECTION_REPLACE_EBA:

  • Open gedit
  • Switch to "IPA (SIL)" keyboard
  • Type abcndef
  • click after f
  • press ← key (cursor left) three times to select def
  • press > key
  • verify that def is deleted and the remaining text is abcŋ

• TEST_SELECTION_REPLACE_ABE:

  • Open gedit
  • Switch to "IPA (SIL)" keyboard
  • Type abcndef
  • click after n
  • press → key (cursor right) three times to select def
  • press > key
  • verify that def is deleted and the remaining text is abcŋ

[ermshiperete]

Moved to A18S16 where according to the project plan text selection bugs are scheduled