From f8225ed9219f23cf04bd378ec43e1e1a1059a0ed Mon Sep 17 00:00:00 2001
From: Pascal Kuthe
Date: Thu, 16 Feb 2023 22:15:06 +0100
Subject: fix panic when deleting overlapping ranges

Some deletion operations (especially those that use indentation)
can generate overlapping deletion ranges when using multiple cursors.
To fix that problem a new `Transaction::delete` and
`Transaction:delete_by_selection` function were added. These functions
merge overlapping deletion ranges instead of generating an invalid
transaction. This merging of changes is only possible for deletions
and not for other changes and therefore require its own function.

The function has been used in all commands that currently delete
text by using `Transaction::change_by_selection`.
---
 helix-term/tests/test/commands.rs | 44 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

(limited to 'helix-term/tests/test')

diff --git a/helix-term/tests/test/commands.rs b/helix-term/tests/test/commands.rs
index 342a849b..1efb204e 100644
--- a/helix-term/tests/test/commands.rs
+++ b/helix-term/tests/test/commands.rs
@@ -385,3 +385,47 @@ async fn test_character_info() -> anyhow::Result<()> {
 
     Ok(())
 }
+
+#[tokio::test(flavor = "multi_thread")]
+async fn test_delete_char_backward() -> anyhow::Result<()> {
+    // don't panic when deleting overlapping ranges
+    test((
+        platform_line("#(x|)# #[x|]#").as_str(),
+        "c<space><backspace><esc>",
+        platform_line("#[\n|]#").as_str(),
+    ))
+    .await?;
+    test((
+        platform_line("#( |)##( |)#a#( |)#axx#[x|]#a").as_str(),
+        "li<backspace><esc>",
+        platform_line("#(a|)##(|a)#xx#[|a]#").as_str(),
+    ))
+    .await?;
+
+    Ok(())
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn test_delete_word_backward() -> anyhow::Result<()> {
+    // don't panic when deleting overlapping ranges
+    test((
+        platform_line("fo#[o|]#ba#(r|)#").as_str(),
+        "a<C-w><esc>",
+        platform_line("#[\n|]#").as_str(),
+    ))
+    .await?;
+    Ok(())
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn test_delete_word_forward() -> anyhow::Result<()> {
+    // don't panic when deleting overlapping ranges
+    test((
+        platform_line("fo#[o|]#b#(|ar)#").as_str(),
+        "i<A-d><esc>",
+        platform_line("fo#[\n|]#").as_str(),
+    ))
+    .await?;
+    Ok(())
+}
+
-- 
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