[Bf-blender-cvs] [95afc53604d] master: Fix T83716: Dope Sheet, incorrect scaling of channel UI elements

[Vincent Blankfield]

Commit: 95afc53604de148c0ed7cfbee88906ae09f6b807
Author: Vincent Blankfield
Date:   Fri Dec 18 14:04:58 2020 +0100
Branches: master
https://developer.blender.org/rB95afc53604de148c0ed7cfbee88906ae09f6b807

Fix T83716: Dope Sheet, incorrect scaling of channel UI elements

Change the top coordinate of the animation channel list UI elements to
`rect->ymin` so they correctly span from `rect->ymin` to
`channel_height`.

Some buttons in the dope sheet channels didn't scale properly with the
`Keyframe Scale Factor` preferences setting. This was caused by using
the `ymid` value (`ymid = BLI_rctf_cent_y(rect) - 0.5f * ICON_WIDTH`) to
position the buttons that supposed to fill all vertical space in the
channel (with `channel_height` height). The `ymid` value is only
appropriate for the UI elements that with `ICON_WIDTH` height.

Maniphest Tasks: T83716

Reviewed by: sybren

Differential Revision: https://developer.blender.org/D9841

===================================================================

M	source/blender/editors/animation/anim_channels_defines.c

===================================================================

diff --git a/source/blender/editors/animation/anim_channels_defines.c b/source/blender/editors/animation/anim_channels_defines.c
index c70a86eab1d..6cb829d3a23 100644
--- a/source/blender/editors/animation/anim_channels_defines.c
+++ b/source/blender/editors/animation/anim_channels_defines.c
@@ -5353,7 +5353,7 @@ void ANIM_channel_draw_widgets(const bContext *C,
                                 "",
                                 ICON_NONE,
                                 offset,
-                                ymid,
+                                rect->ymin,
                                 SLIDER_WIDTH,
                                 channel_height);
             UI_but_func_set(but, achannel_setting_slider_nla_curve_cb, ale->id, ale->data);
@@ -5411,7 +5411,7 @@ void ANIM_channel_draw_widgets(const bContext *C,
                             "",
                             icon,
                             offset,
-                            ymid,
+                            rect->ymin,
                             ICON_WIDTH,
                             channel_height);
             }
@@ -5437,7 +5437,7 @@ void ANIM_channel_draw_widgets(const bContext *C,
                             "",
                             icon,
                             offset,
-                            ymid,
+                            rect->ymin,
                             ICON_WIDTH,
                             channel_height);
             }
@@ -5457,7 +5457,7 @@ void ANIM_channel_draw_widgets(const bContext *C,
                             "",
                             ICON_NONE,
                             offset,
-                            ymid,
+                            rect->ymin,
                             width,
                             channel_height);
             }
@@ -5483,7 +5483,7 @@ void ANIM_channel_draw_widgets(const bContext *C,
                                 "",
                                 ICON_NONE,
                                 offset,
-                                ymid,
+                                rect->ymin,
                                 SLIDER_WIDTH,
                                 channel_height);