Merge branch 'master' into temp-gpencil-bezier-stroke-type

Fix T88058: Hover+return doesn't accept 0 as input

When the user hovered over a number input field, pressed Enter and then
typed in '0', confirming the input would always cancel the action. This
is because in this particular case `ui_textedit_begin` is called
instead of `ui_numedit_begin`. This function will not set
`data->startvalue` (leaving it at `0`) which will then trigger the
cancel in `ui_apply_but_NUM` which checks if the input changed (by
comparing the entered value with `data->startvalue`).

The fix makes sure that when `ui_textedit_begin` is called on a number
button, the `data->startvalue` is set correctly like in
`ui_numedit_begin`.

Breaking commit: rBSeb06ccc32462beaacbb114d6d0e450b6fc911047

Note: This also affects pressing tab to move to a new number field and
entering '0'. The fix will also cover this case.

Reviewed By: Severin, #user_interface

Maniphest Tasks: T88058

Differential Revision: https://developer.blender.org/D11168

Merge branch 'blender-v2.93-release'

Fix T87983: Motion tracker button tooltips identical

The tooltips for the tracker buttons were all equal (because they all
use the same operator).

This adds the `get_description` operator callback to the
`CLIP_OT_track_markers` operator and returns a more descriptive
tooltip for the different buttons.

Reviewed By: mont29

Maniphest Tasks: T87983

Differential Revision: https://developer.blender.org/D11145

Merge branch 'master' into temp-gpencil-bezier-stroke-type

GPencil: Bezier stroke smooth modifer

This commits adds an extension of the `BKE_gpencil_editcurve_smooth`
function. `BKE_gpencil_editcurve_smooth_ex` allows the use of vertex
groups and curve mappings. This new function is used to implement the
smooth modifier for bezier strokes.

GPencil: Initial bezier support for smooth modifier

This adds the `deformBezier` callback for the smooth modifier.
At the moment this does not support vertex group influence and
custom curve falloff.

GPencil: Implement Merge by Distance for curves

This commit adds the `BKE_gpencil_editcurve_merge_distance` function.
It will merge the control points by distance (always at the first point).

Merge branch 'master' into temp-gpencil-bezier-stroke-type

Merge branch 'master' into temp-gpencil-bezier-stroke-type