[gnome-builder] lsp: Set content format to markdown for hover in client

[Christian Hergert <chergert src gnome org>]

commit 87a268459a1097bf5d4bb00b41a277c4bc5611b5
Author: vanadiae <vanadiae35 gmail com>
Date:   Tue Jul 20 20:13:32 2021 +0200

    lsp: Set content format to markdown for hover in client
    
    This makes rust-analyzer output real markdown with proper newlines.

 src/libide/lsp/ide-lsp-client.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/src/libide/lsp/ide-lsp-client.c b/src/libide/lsp/ide-lsp-client.c
index bdd1c6a5f..0e72fe720 100644
--- a/src/libide/lsp/ide-lsp-client.c
+++ b/src/libide/lsp/ide-lsp-client.c
@@ -1672,6 +1672,12 @@ ide_lsp_client_start (IdeLspClient *self)
             "]",
           "}",
         "}",
+        "hover", "{",
+          "contentFormat", "[",
+            "markdown",
+            "plaintext",
+          "]",
+        "}",
         "publishDiagnostics", "{",
           "tagSupport", "{",
             "valueSet", "[",