Update dialog.md with info about filter extensions

etiktin · etiktin · commit db2f0a68e8ff · 2015-08-21T21:18:37.000+03:00
There was some confusion about the correct way to add an `All Files` filter (see electron#2525), so I added it to the example. Also added a short note about the extension syntax. This is related to PR electron#2547.
diff --git a/docs/api/dialog.md b/docs/api/dialog.md
@@ -36,10 +36,12 @@ selected, an example is:
   filters: [
     { name: 'Images', extensions: ['jpg', 'png', 'gif'] },
     { name: 'Movies', extensions: ['mkv', 'avi', 'mp4'] },
-    { name: 'Custom File Type', extensions: ['as'] }
+    { name: 'Custom File Type', extensions: ['as'] },
+    { name: 'All Files', extensions: ['*'] }
   ]
 }
 ```
+The `extensions` array should contain extensions without wildcards or dots (e.g. `'png'` is good, `'.png'` and `'*.png'` are bad). To show all files, use the `'*'` wildcard (no other wildcard is supported).
 
 If a `callback` is passed, the API call would be asynchronous and the result
 would be passed via `callback(filenames)`

Original file line number	Diff line number	Diff line change
`@@ -36,10 +36,12 @@ selected, an example is:`
`36`	`36`	`filters: [`
`37`	`37`	`{ name: 'Images', extensions: ['jpg', 'png', 'gif'] },`
`38`	`38`	`{ name: 'Movies', extensions: ['mkv', 'avi', 'mp4'] },`
`39`		`- { name: 'Custom File Type', extensions: ['as'] }`
	`39`	`+ { name: 'Custom File Type', extensions: ['as'] },`
	`40`	`+ { name: 'All Files', extensions: ['*'] }`
`40`	`41`	`]`
`41`	`42`	`}`
`42`	`43`	```
	`44`	+The `extensions` array should contain extensions without wildcards or dots (e.g. `'png'` is good, `'.png'` and `'.png'` are bad). To show all files, use the `''` wildcard (no other wildcard is supported).
`43`	`45`
`44`	`46`	If a `callback` is passed, the API call would be asynchronous and the result
`45`	`47`	would be passed via `callback(filenames)`