xterm: use the DA1 query to determine if sixel enabled.

hzeller · hzeller · commit 0f64f01fcbf4 · 2025-01-04T10:07:14.000+01:00
xterm only has sixel enabled if started with `-ti vt340`; the
recently added DA1 query will help to determine if we can use
sixel output or need to use unicode blocks.
diff --git a/src/term-query.cc b/src/term-query.cc
@@ -286,7 +286,7 @@ TermGraphicsInfo QuerySupportedGraphicsProtocol() {
                           result.preferred_graphics = GraphicsProtocol::kSixel;
                       }
                       if (find_str(data, len, "XTerm")) {
-                          result.preferred_graphics = GraphicsProtocol::kSixel;
+                          // Don't know yet if supports sixel, will query below
                           result.known_broken_sixel_cursor_placement = true;
                       }
                       if (find_str(data, len, "foot")) {

Original file line number	Diff line number	Diff line change
`@@ -286,7 +286,7 @@ TermGraphicsInfo QuerySupportedGraphicsProtocol() {`
`286`	`286`	`result.preferred_graphics = GraphicsProtocol::kSixel;`
`287`	`287`	`}`
`288`	`288`	`if (find_str(data, len, "XTerm")) {`
`289`		`- result.preferred_graphics = GraphicsProtocol::kSixel;`
	`289`	`+ // Don't know yet if supports sixel, will query below`
`290`	`290`	`result.known_broken_sixel_cursor_placement = true;`
`291`	`291`	`}`
`292`	`292`	`if (find_str(data, len, "foot")) {`