Adds the bind `add_selection_for_next_occurrence` to TextEdit, with CTRL+D as the default shortcut.
When the bind is performed, ff a selection is currently active with the last caret in text fields, searches for the next occurrence of the selection, adds a caret and selects the next occurrence.
If no selection is currently active with the last caret in text fields, selects the word currently under the caret.
The action can be performed sequentially for all occurrences of the selection of the last caret and for all existing carets. The viewport is adjusted to the latest newly added caret.
The bind and the behaviour is similar to VS Code's "Add Selection to Next Find Match" and JetBrains' "Add Selection for Next Occurrence". It takes advantage of the multi-caret API.
The default shortcut for `select_word_under_caret` has been changed to ALT+G, in order to give priority to CTRL+D for `add_selection_for_next_occurrence` to better align with popular IDEs and editors.
The incoming value is validated first and then compared.
Previously, when the ScrollContainer was scrolled, the ScrollBar of
the other axis of the ScrollContainer would emit the changed signal.
This commit avoids that.
1. Viewport::get_visible_rect().position is always zero.
So Control::get_window_rect is identical to Control::get_global_rect.
Remove Control::get_window_rect since it is not used in the source code.
2. sqrt(a * a) = abs(a) for doubles
3. Simplify affine_inverse combination
4. Simplify calculation in shaders
The visibility of the `ScrollBar` was used as a condition for judging whether it should scroll.
**Visible** and **scrollable** are currently not the same in some cases (`SCROLL_MODE_SHOW_NEVER`).
This makes `SCROLL_MODE_SHOW_NEVER` not working properly.
This patch will make `SCROLL_MODE_SHOW_NEVER` available, so that the external `SrollBar` can
share the internal `ScrollBar`'s data, we can achieve the purpose of replacing the internal
`ScrollBar` with a custom external one.
Replace all TODO uses of `#warning` by proper TODO comments, and will open
matching bug reports to keep track of them.
We don't have a great track record fixing TODOs, but I'd wager we're even
worse for fixing these "TODO #warning" so we should prohibit this usage.
Now, `caret_can_draw` will be validated when a condition that affects
the drawability of the `LineEdit`'s caret changes; `draw_caret` will
be toggled when the caret's visibility is toggled due to blink, and
`draw_caret` will be `false` when `caret_blink_enabled` is disabled.
Fix toggling `caret_blink_enabled` could cause caret to no longer be
displayed.
Fix opening the context menu causing caret to no longer appear.
