Having a mechanism for visually displaying ranges and reacting to interactions with them would be useful for many features so it would be valuable to create good reusable infrastructure for that. Here is a rough proposal of the code for that could be structured.

HexdumpHighlighter - interface for module which can provide the highlighted ranges to hexdump widget and reacts to events
- method: getHilightRanges(memoryRange) -> [HighlightRange] mehtod which returns list of HighlightRanges which intersect with requested memory range. Called by hexdump widget when position changes. Returns info about memoryRange instead of all executable becuse they could be dynamically calculated.
- signal: highlightsChanged indicates when the highlights changed without change in position.
- method: onRangeClicked(hilightRange, mouseEvent) called by hexdumpWidget when a hilightRange returned by this HexdumpHighlighter is clicked. Allows implementing interaction.
- method: onRangeContextMenu(highlightRange, contextMenuEvent) called when a range is right clicked or context menu is triggered using keyboard, similar to onRangeClicked
- method: onRangeXXX called for other kind of events if necesarry
HighlightRange - structure describes single highlight range
- memoryRange
- id - can simplify highlighter code for reacting to onRangeClicked and other events
- visual style
- tooltip

Ideas for highlight style properties

background color
font color
colored underline
corner marker

Multiple instances of HexdumpHighlighter could be added to hexdump widget.

Ideas for uses of this mechanism

Manual highlighting by user - Hexdump color highlighting #1945
data structure visualization
Diff visualization Diffing mode #1104
Click for jumping to address Clicking on a Sequence of bytes to be highlighted #1411 Double click on an address on hexdump will seek to this address #1470
Comment and flag displaying within hexdump widget
plugins
stack visualization, marking the address pointed by register

Uh oh!

Hexdump color highlighting #1945

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