[Bug tui/27680] New: ui-style.c:243: internal-error: bool ui_file_style::parse(const char*, size_t*): Assertion `match == 0' failed.'

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27680

            Bug ID: 27680
           Summary: ui-style.c:243: internal-error: bool
                    ui_file_style::parse(const char*, size_t*): Assertion
                    `match == 0' failed.'
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tui
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

On openSUSE tumbleweed I'm running into a cluster of tui fails:
...
FAIL: gdb.tui/basic.exp: asm window shows main
ERROR: invalid command name "_csi_L"
FAIL: gdb.tui/basic.exp: source box in split layout (ll corner)
FAIL: gdb.tui/basic.exp: asm box in split layout (ul corner)
FAIL: gdb.tui/list.exp: asm window shows main
ERROR: invalid command name "_csi_L"
ERROR: invalid command name "_csi_L"
FAIL: gdb.tui/list.exp: source is still visible
FAIL: gdb.tui/new-layout.exp: example layout shows assembly
ERROR: invalid command name "_csi_L"
FAIL: gdb.tui/new-layout.exp: right window box (ul corner)
FAIL: gdb.tui/new-layout.exp: horizontal display
ERROR: invalid command name "_csi_L"
FAIL: gdb.tui/new-layout.exp: right window box after shrink (ul corner)
ERROR: invalid command name "_csi_L"
FAIL: gdb.tui/new-layout.exp: right window box after grow (ul corner)
FAIL: gdb.tui/tui-layout-asm-short-prog.exp: check asm box contents
ERROR: invalid command name "_csi_L"
ERROR: invalid command name "_csi_L"
FAIL: gdb.tui/tui-layout-asm.exp: check asm box contents
...

The first FAIL happens after we hit:
...
+++ Inserted string '+', cursor: (14, 79) -> (15, 0)
+++ wait_for: _csi_G <<<80>>>
+++ Cursor Horizontal Absolute (80), cursor: (15, 0) -> (15, 79)
+++ wait_for: _csi_m <<<39>>>
+++ Select Graphic Rendition (39), cursor: (15, 79) -> (15, 79)
+++ wait_for: _csi_m <<<0;10>>>
+++ Select Graphic Rendition (0, 10), cursor: (15, 79) -> (15, 79)
^[[H^[[0;10;1m^[[36m+-^[[77b+|^[[80G||^[[80G||^[[80G||^[[80G||^[[80G||^[[80G||^[[80G||^[\
[80G||^[[80G||^[[80G||^[[80G||^[[80G||^[[80G|+-^[[77b+^[[B^[[39m^[[0;10m^[[19d/data/gdb_versions/devel/src/gdb/ui-style.c:243:
internal-error: bool ui_file_style::parse(const char*, size_t*): Assertion
`match == 0' failed.^M^[[BA problem internal to GDB has been
detected,^M^[[Bfurther debugging may prove unreliable.^M^[[BQuit this debugging
session? (y or n) +++ wait_for: _csi_H <<<>>>
+++ Cursor Position (1, 1), cursor: (15, 79) -> (0, 0)
+++ wait_for: _csi_m <<<0;10;1>>>
+++ Select Graphic Rendition (0, 10, 1), cursor: (0, 0) -> (0, 0)
+++ wait_for: _csi_m <<<36>>>
...

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