[FIX] mail: smaller thumbnails in attachment list

Before this commit, when showing list of attachments in a message
or attachment box, the images were too big. This made it hard to
see other content due to the big size of the images.

This commit fixes the issue by reducing the size of image previews
when in context of many attachments. When a message has a single
image, it keeps showing a big preview of this image.

Also slightly reduce size of images in attachment box, as they were
also too big.

closes odoo/odoo#134941

X-original-commit: cf2069e0f7cd36c4d2b3bcc79fdde7e0425e2e52
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

addons/mail/static/src/core/common/message.xml

@@ -110,7 +110,7 @@
                                     t-if="message.attachments.length > 0"
                                     attachments="message.attachments.map((a) => a)"
                                     unlinkAttachment.bind="onClickAttachmentUnlink"
-                                    imagesHeight="300"/>
+                                    imagesHeight="message.attachments.length === 1 ? 300 : 75"/>
                                 <LinkPreviewList t-if="message.linkPreviews.length > 0 and store.hasLinkPreviewFeature and !message.linkPreviewSquash" linkPreviews="message.linkPreviews" deletable="deletable"/>
                             </div>
                             <t t-if="!message.hasTextContent or env.inChatWindow" t-call="mail.Message.actions"/>

addons/mail/static/src/core/web/chatter.xml

@@ -98,7 +98,7 @@
                     <AttachmentList
                         attachments="attachments"
                         unlinkAttachment.bind="unlinkAttachment"
-                        imagesHeight="160"
+                        imagesHeight="100"
                     />
                     <FileUploader multiUpload="true" fileUploadClass="'o-mail-Chatter-fileUploader'" onUploaded.bind="onUploaded" onClick="(ev) => this.onClickAttachFile(ev)">
                         <t t-set-slot="toggler">