Fix scroll region defaults

Author: SqlRush

docs/cc-100-roadmap.md

@@ -124,6 +124,8 @@ M7 补充：terminal CSI parser 现在把 TBC tab-clear (`CSI g`/`CSI 3g`) 解
 
 M7 补充：terminal CSI parser 现在把 REP repeat-preceding-character (`CSI b`/`CSI 4b`) 解析成 edit action，visible-text/snapshot pipeline 和 ANSI message wrapping/trim 会按重复次数展开前一个可重复 grapheme。
 
+M7 补充：terminal CSI parser 现在按 ANSI 默认参数解析 scroll-region (`CSI r`/`CSI ;10r`)，缺失 top 默认为 1，缺失 bottom 保持为 0 表示 reset/full-height，避免把 reset 误判为单行区域。
+
 M7 补充：terminal CSI parser 现在把 DECSTR soft reset (`CSI !p`) 解析成 reset action，terminal parser 会复用现有 reset 流程清理 SGR/link 状态，避免软复位序列落入 generic unknown。
 
 M7 补充：prompt history 写入现在按官方 `history.ts` 过滤 image pasted content，不再把 image base64/filename/mediaType 写入 `history.jsonl`；历史读取仍兼容旧 image metadata。

docs/claude-code-go-rewrite-plan.md

@@ -242,6 +242,7 @@ test/parity/                 # golden tests against TS/official behavior
 - 本轮补充：terminal CSI parser 把 xterm window manipulation/report (`CSI t`) 归入 report action，覆盖常见 `CSI 14t`/`CSI 18t` 窗口/文本区尺寸查询。
 - 本轮补充：terminal CSI parser 把 TBC tab-clear (`CSI g`/`CSI 3g`) 归入 cursor action，保留 clear-current/all code。
 - 本轮补充：terminal CSI parser 把 REP repeat-preceding-character (`CSI b`) 归入 edit action，visible-text/snapshot pipeline 和 ANSI message wrapping/trim 会按重复次数展开前一个可重复 grapheme。
+- 本轮补充：terminal CSI parser 按 ANSI 默认参数解析 scroll-region (`CSI r`/`CSI ;10r`)，缺失 top 默认为 1，缺失 bottom 保持 0 表示 reset/full-height，避免 reset scroll region 被误判为单行区域。
 - 本轮补充：terminal CSI parser 把 DECSTR soft reset (`CSI !p`) 归入 reset action，并在 terminal parser 中清理 SGR/link 状态。
 - 本轮补充：prompt history 写入按官方 `history.ts` 跳过 image pasted content，避免把 image base64/filename/mediaType 存入 `history.jsonl`，读取路径仍兼容旧 image metadata。
 - 本轮补充：paste-cache 增加按 cutoff mtime 清理旧 `.txt` paste 文件的 best-effort 入口，忽略缺失目录、非 `.txt` 文件和单文件错误，和官方 `cleanupOldPastes` 语义对齐。

docs/first-second-parity-audit.md

@@ -183,6 +183,7 @@ M7 progress now includes:
 - `internal/tui`: terminal OSC helpers now expose a lightweight `ParseOSCContent` covering title, hyperlink, tab-status, and unknown action branches.
 - `internal/tui`: terminal OSC helpers now parse complete BEL- or ST-terminated OSC sequences into `ParseOSCContent` actions.
 - `internal/tui`: terminal OSC parsing now dispatches clipboard, progress, and common notification sequences as structured actions while keeping visible-text stripping behavior intact.
+- `internal/tui`: terminal CSI scroll-region parsing now preserves ANSI default semantics for reset/omitted parameters instead of treating `CSI r` as a one-line region.
 - `internal/tui`: terminal renderer constants now include clear-scrollback and legacy Windows cursor-home helpers for official clear-terminal sequence parity without platform auto-detection.
 - `internal/tui`: terminal CSI helpers now generate cursor movement/position and erase sequences with official zero-move and horizontal-first cursorMove semantics.
 - `internal/tui`: terminal CSI helpers now generate scroll up/down and scroll-region sequences with official zero-scroll behavior.

internal/tui/terminal_csi.go

@@ -372,7 +372,7 @@ func ParseCSISequence(sequence string) (CSIAction, bool) {
 	case CSICommandScrollDown:
 		return CSIAction{Type: CSIActionScroll, Scroll: CSIScrollAction{Type: CSIScrollActionDown, Count: p0}}, true
 	case CSICommandScrollRegion:
-		return CSIAction{Type: CSIActionScroll, Scroll: CSIScrollAction{Type: CSIScrollActionSetRegion, Top: p0, Bottom: p1}}, true
+		return csiScrollRegion(params), true
 	case CSICommandSaveCursor:
 		return CSIAction{Type: CSIActionCursor, Cursor: CSICursorAction{Type: CSICursorActionSave}}, true
 	case CSICommandWindowReport:
@@ -477,6 +477,18 @@ func csiWindowReport(code int, privateMode byte) CSIAction {
 	}
 }
 
+func csiScrollRegion(params []int) CSIAction {
+	top := 1
+	if len(params) > 0 && params[0] > 0 {
+		top = params[0]
+	}
+	bottom := 0
+	if len(params) > 1 && params[1] > 0 {
+		bottom = params[1]
+	}
+	return CSIAction{Type: CSIActionScroll, Scroll: CSIScrollAction{Type: CSIScrollActionSetRegion, Top: top, Bottom: bottom}}
+}
+
 func csiEraseDisplayRegion(index int) CSIEraseRegion {
 	switch index {
 	case 1:

internal/tui/tui_test.go

@@ -3616,7 +3616,8 @@ func TestParseCSISequenceActions(t *testing.T) {
 		{seq: CSISequence(2, "S"), want: CSIScrollAction{Type: CSIScrollActionUp, Count: 2}},
 		{seq: CSISequence(3, "T"), want: CSIScrollAction{Type: CSIScrollActionDown, Count: 3}},
 		{seq: CSISequence(4, 10, "r"), want: CSIScrollAction{Type: CSIScrollActionSetRegion, Top: 4, Bottom: 10}},
-		{seq: ResetScrollRegion, want: CSIScrollAction{Type: CSIScrollActionSetRegion, Top: 1, Bottom: 1}},
+		{seq: ResetScrollRegion, want: CSIScrollAction{Type: CSIScrollActionSetRegion, Top: 1}},
+		{seq: CSISequence(";10r"), want: CSIScrollAction{Type: CSIScrollActionSetRegion, Top: 1, Bottom: 10}},
 	}
 	for _, tc := range scrollCases {
 		action, ok := ParseCSISequence(tc.seq)