Only report captions when entering and exiting them (#16445)

Fixes #14874

Summary of the issue:
NVDA reports the word "caption" before every element in a figcaption element, or before each line in same when navigating by line in browse mode.

Description of user facing changes
NVDA now reports "caption" only when first entering a figure caption, and "out of caption" when leaving it.

Description of development approach
Changed textInfos.ControlField.getPresentationCategory to return PRESCAT_CONTAINER when its role is controlTypes.Role.CAPTION .

source/textInfos/__init__.py

@@ -141,7 +141,6 @@ def getPresentationCategory(
 				controlTypes.Role.TREEVIEW, 
 				controlTypes.Role.CHECKMENUITEM, 
 				controlTypes.Role.RADIOMENUITEM,
-				controlTypes.Role.CAPTION,
 			)
 			or (role == controlTypes.Role.EDITABLETEXT and controlTypes.State.MULTILINE not in states and (controlTypes.State.READONLY not in states or controlTypes.State.FOCUSABLE in states))
 			or (role == controlTypes.Role.LIST and controlTypes.State.READONLY not in states)
@@ -170,6 +169,7 @@ def getPresentationCategory(
 				controlTypes.Role.BLOCKQUOTE,
 				controlTypes.Role.GROUPING,
 				controlTypes.Role.FIGURE,
+				controlTypes.Role.CAPTION,
 				controlTypes.Role.REGION,
 				controlTypes.Role.FRAME,
 				controlTypes.Role.INTERNALFRAME,

user_docs/en/changes.md

@@ -9,6 +9,7 @@
 ### Changes
 
 * The fallback braille input table is now equal to the fallback output table, which is Unified English Braille Code grade 1. (#9863, @JulienCochuyt, @LeonarddeR)
+* When reading by line in browse mode, "caption" is no longer reported on each line of a long figure or table caption. (#14874)
 
 ### Bug Fixes